8521565723 has 12 divisors (see below), whose sum is σ = 9565977120. Its totient is φ = 7582045680.

The previous prime is 8521565693. The next prime is 8521565729. The reversal of 8521565723 is 3275651258.

It is not a de Polignac number, because 8521565723 - 2⁶ = 8521565659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521565729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 743528 + ... + 754901.

It is an arithmetic number, because the mean of its divisors is an integer number (797164760).

Almost surely, 2^8521565723 is an apocalyptic number.

8521565723 is a deficient number, since it is larger than the sum of its proper divisors (1044411397).

8521565723 is a wasteful number, since it uses less digits than its factorization.

8521565723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498498 (or 1498487 counting only the distinct ones).

The product of its digits is 504000, while the sum is 44.

The square root of 8521565723 is about 92312.3270370756. The cubic root of 8521565723 is about 2042.5520510569.

The spelling of 8521565723 in words is "eight billion, five hundred twenty-one million, five hundred sixty-five thousand, seven hundred twenty-three".